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Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Cash paid | $ 87 |
Other payable | 4 |
Recorded earn-out payable | 5 | $ 9
Total consideration | 96 |
Maximum potential earn-out payable | 20 |
Allocation of purchase price: |  |
Cash and equivalents | 4 |
Fiduciary cash | 16 |
Fiduciary receivables | 19 |
Other current assets | 2 |
Goodwill | 55 |
Other assets | 4 |
Total assets acquired | 130 |
Fiduciary liabilities | (29) |
Other current liabilities | (4) |
Other long-term liabilities | (1) |
Total liabilities assumed | (34) |
Net assets acquired | 96 |
Various | Other Acquisitions |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Cash paid | 33 |
Other payable | 4 |
Recorded earn-out payable | 5 |
Total consideration | 42 |
Maximum potential earn-out payable | 20 |
Allocation of purchase price: |  |
Cash and equivalents | 4 |
Fiduciary cash | 3 |
Fiduciary receivables | 19 |
Other current assets | 0 |
Goodwill | 22 |
Other assets | 4 |
Total assets acquired | 65 |
Fiduciary liabilities | (19) |
Other current liabilities | (3) |
Other long-term liabilities | (1) |
Total liabilities assumed | (23) |
Net assets acquired | 42 |
Wholesale | NBS Insurance Agency |  |
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Cash paid | 54 |
Other payable | 0 |
Recorded earn-out payable | 0 |
Total consideration | 54 |
Maximum potential earn-out payable | 0 |
Allocation of purchase price: |  |
Cash and equivalents | 0 |
Fiduciary cash | 13 |
Fiduciary receivables | 0 |
Other current assets | 2 |
Goodwill | 33 |
Other assets | 0 |
Total assets acquired | 65 |
Fiduciary liabilities | (10) |
Other current liabilities | (1) |
Total liabilities assumed | (11) |
Net assets acquired | 54 |
Purchased Customer Accounts and Other Intangibles |  |
Allocation of purchase price: |  |
Purchased customer accounts and other intangibles | 30 |
Purchased Customer Accounts and Other Intangibles | Various | Other Acquisitions |  |
Allocation of purchase price: |  |
Purchased customer accounts and other intangibles | 13 |
Purchased Customer Accounts and Other Intangibles | Wholesale | NBS Insurance Agency |  |
Allocation of purchase price: |  |
Purchased customer accounts and other intangibles | $ 17 |

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